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<h1 class="title">expandingdelegates.qml 示例文件</h1>
<span class="subtitle">views/listview/expandingdelegates.qml</span>
<!-- $$$views/listview/expandingdelegates.qml-description -->
<div class="descr"> <a name="details"></a>
<pre class="qml">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
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  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
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  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
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  ** met:
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  import QtQuick 2.0
  import &quot;content&quot;

  <span class="comment">// This example illustrates expanding a list item to show a more detailed view.</span>

  <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
      <span class="name">id</span>: <span class="name">page</span>
      <span class="name">width</span>: <span class="number">400</span>; <span class="name">height</span>: <span class="number">240</span>
      <span class="name">color</span>: <span class="string">&quot;black&quot;</span>

      <span class="comment">// Delegate for the recipes.  This delegate has two modes:</span>
      <span class="comment">// 1. List mode (default), which just shows the picture and title of the recipe.</span>
      <span class="comment">// 2. Details mode, which also shows the ingredients and method.</span>
      <span class="type"><a href="../qtqml/qml-qtqml-component.html">Component</a></span> {
          <span class="name">id</span>: <span class="name">recipeDelegate</span>
          <span class="type"><a href="qml-qtquick-item.html">Item</a></span> {
              <span class="name">id</span>: <span class="name">recipe</span>

              <span class="comment">// Create a property to contain the visibility of the details.</span>
              <span class="comment">// We can bind multiple element's opacity to this one property,</span>
              <span class="comment">// rather than having a &quot;PropertyChanges&quot; line for each element we</span>
              <span class="comment">// want to fade.</span>
              property <span class="type"><a href="../qtqml/qml-real.html">real</a></span> <span class="name">detailsOpacity</span> : <span class="number">0</span>
              <span class="name">width</span>: <span class="name">listView</span>.<span class="name">width</span>
              <span class="name">height</span>: <span class="number">70</span>

              <span class="comment">// A simple rounded rectangle for the background</span>
              <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
                  <span class="name">id</span>: <span class="name">background</span>
                  <span class="name">x</span>: <span class="number">2</span>; <span class="name">y</span>: <span class="number">2</span>; <span class="name">width</span>: <span class="name">parent</span>.<span class="name">width</span> <span class="operator">-</span> <span class="name">x</span><span class="operator">*</span><span class="number">2</span>; <span class="name">height</span>: <span class="name">parent</span>.<span class="name">height</span> <span class="operator">-</span> <span class="name">y</span><span class="operator">*</span><span class="number">2</span>
                  <span class="name">color</span>: <span class="string">&quot;ivory&quot;</span>
                  <span class="name">border</span>.color: <span class="string">&quot;orange&quot;</span>
                  <span class="name">radius</span>: <span class="number">5</span>
              }

              <span class="comment">// This mouse region covers the entire delegate.</span>
              <span class="comment">// When clicked it changes mode to 'Details'.  If we are already</span>
              <span class="comment">// in Details mode, then no change will happen.</span>
              <span class="type"><a href="qml-qtquick-mousearea.html">MouseArea</a></span> {
                  <span class="name">anchors</span>.fill: <span class="name">parent</span>
                  <span class="name">onClicked</span>: <span class="name">recipe</span>.<span class="name">state</span> <span class="operator">=</span> <span class="string">'Details'</span>;
              }

              <span class="comment">// Lay out the page: picture, title and ingredients at the top, and method at the</span>
              <span class="comment">// bottom.  Note that elements that should not be visible in the list</span>
              <span class="comment">// mode have their opacity set to recipe.detailsOpacity.</span>

              <span class="type"><a href="qml-qtquick-row.html">Row</a></span> {
                  <span class="name">id</span>: <span class="name">topLayout</span>
                  <span class="name">x</span>: <span class="number">10</span>; <span class="name">y</span>: <span class="number">10</span>; <span class="name">height</span>: <span class="name">recipeImage</span>.<span class="name">height</span>; <span class="name">width</span>: <span class="name">parent</span>.<span class="name">width</span>
                  <span class="name">spacing</span>: <span class="number">10</span>

                  <span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
                      <span class="name">id</span>: <span class="name">recipeImage</span>
                      <span class="name">width</span>: <span class="number">50</span>; <span class="name">height</span>: <span class="number">50</span>
                      <span class="name">source</span>: <span class="name">picture</span>
                  }
                  <span class="type"><a href="qml-qtquick-column.html">Column</a></span> {
                      <span class="name">width</span>: <span class="name">background</span>.<span class="name">width</span> <span class="operator">-</span> <span class="name">recipeImage</span>.<span class="name">width</span> <span class="operator">-</span> <span class="number">20</span>; <span class="name">height</span>: <span class="name">recipeImage</span>.<span class="name">height</span>
                      <span class="name">spacing</span>: <span class="number">5</span>

                      <span class="type"><a href="qml-qtquick-text.html">Text</a></span> {
                          <span class="name">text</span>: <span class="name">title</span>
                          <span class="name">font</span>.bold: <span class="number">true</span>; <span class="name">font</span>.pointSize: <span class="number">16</span>
                      }

                      <span class="type">SmallText</span> {
                          <span class="name">text</span>: <span class="string">&quot;Ingredients&quot;</span>
                          <span class="name">font</span>.bold: <span class="number">true</span>
                          <span class="name">opacity</span>: <span class="name">recipe</span>.<span class="name">detailsOpacity</span>
                      }

                      <span class="type">SmallText</span> {
                          <span class="name">text</span>: <span class="name">ingredients</span>
                          <span class="name">wrapMode</span>: <span class="name">Text</span>.<span class="name">WordWrap</span>
                          <span class="name">width</span>: <span class="name">parent</span>.<span class="name">width</span>
                          <span class="name">opacity</span>: <span class="name">recipe</span>.<span class="name">detailsOpacity</span>
                      }
                  }
              }

              <span class="type"><a href="qml-qtquick-item.html">Item</a></span> {
                  <span class="name">id</span>: <span class="name">details</span>
                  <span class="name">x</span>: <span class="number">10</span>; <span class="name">width</span>: <span class="name">parent</span>.<span class="name">width</span> <span class="operator">-</span> <span class="number">20</span>

                  <span class="type">anchors</span> { <span class="name">top</span>: <span class="name">topLayout</span>.<span class="name">bottom</span>; <span class="name">topMargin</span>: <span class="number">10</span>; <span class="name">bottom</span>: <span class="name">parent</span>.<span class="name">bottom</span>; <span class="name">bottomMargin</span>: <span class="number">10</span> }
                  <span class="name">opacity</span>: <span class="name">recipe</span>.<span class="name">detailsOpacity</span>
                  <span class="type">SmallText</span> {
                      <span class="name">id</span>: <span class="name">methodTitle</span>
                      <span class="name">anchors</span>.top: <span class="name">parent</span>.<span class="name">top</span>
                      <span class="name">text</span>: <span class="string">&quot;Method&quot;</span>
                      <span class="name">font</span>.pointSize: <span class="number">12</span>; <span class="name">font</span>.bold: <span class="number">true</span>
                  }

                  <span class="type"><a href="qml-qtquick-flickable.html">Flickable</a></span> {
                      <span class="name">id</span>: <span class="name">flick</span>
                      <span class="name">width</span>: <span class="name">parent</span>.<span class="name">width</span>
                      <span class="type">anchors</span> { <span class="name">top</span>: <span class="name">methodTitle</span>.<span class="name">bottom</span>; <span class="name">bottom</span>: <span class="name">parent</span>.<span class="name">bottom</span> }
                      <span class="name">contentHeight</span>: <span class="name">methodText</span>.<span class="name">height</span>
                      <span class="name">clip</span>: <span class="number">true</span>

                      <span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">id</span>: <span class="name">methodText</span>; <span class="name">text</span>: <span class="name">method</span>; <span class="name">wrapMode</span>: <span class="name">Text</span>.<span class="name">WordWrap</span>; <span class="name">width</span>: <span class="name">details</span>.<span class="name">width</span> }
                  }

                  <span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
                      <span class="type">anchors</span> { <span class="name">right</span>: <span class="name">flick</span>.<span class="name">right</span>; <span class="name">top</span>: <span class="name">flick</span>.<span class="name">top</span> }
                      <span class="name">source</span>: <span class="string">&quot;content/pics/moreUp.png&quot;</span>
                      <span class="name">opacity</span>: <span class="name">flick</span>.<span class="name">atYBeginning</span> ? <span class="number">0</span> : <span class="number">1</span>
                  }

                  <span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
                      <span class="type">anchors</span> { <span class="name">right</span>: <span class="name">flick</span>.<span class="name">right</span>; <span class="name">bottom</span>: <span class="name">flick</span>.<span class="name">bottom</span> }
                      <span class="name">source</span>: <span class="string">&quot;content/pics/moreDown.png&quot;</span>
                      <span class="name">opacity</span>: <span class="name">flick</span>.<span class="name">atYEnd</span> ? <span class="number">0</span> : <span class="number">1</span>
                  }
              }

              <span class="comment">// A button to close the detailed view, i.e. set the state back to default ('').</span>
              <span class="type">TextButton</span> {
                  <span class="name">y</span>: <span class="number">10</span>
                  <span class="type">anchors</span> { <span class="name">right</span>: <span class="name">background</span>.<span class="name">right</span>; <span class="name">rightMargin</span>: <span class="number">10</span> }
                  <span class="name">opacity</span>: <span class="name">recipe</span>.<span class="name">detailsOpacity</span>
                  <span class="name">text</span>: <span class="string">&quot;Close&quot;</span>

                  <span class="name">onClicked</span>: <span class="name">recipe</span>.<span class="name">state</span> <span class="operator">=</span> <span class="string">''</span>;
              }

              <span class="name">states</span>: <span class="name">State</span> {
                  <span class="name">name</span>: <span class="string">&quot;Details&quot;</span>

                  <span class="type"><a href="qml-qtquick-propertychanges.html">PropertyChanges</a></span> { <span class="name">target</span>: <span class="name">background</span>; <span class="name">color</span>: <span class="string">&quot;white&quot;</span> }
                  <span class="type"><a href="qml-qtquick-propertychanges.html">PropertyChanges</a></span> { <span class="name">target</span>: <span class="name">recipeImage</span>; <span class="name">width</span>: <span class="number">130</span>; <span class="name">height</span>: <span class="number">130</span> } <span class="comment">// Make picture bigger</span>
                  <span class="type"><a href="qml-qtquick-propertychanges.html">PropertyChanges</a></span> { <span class="name">target</span>: <span class="name">recipe</span>; <span class="name">detailsOpacity</span>: <span class="number">1</span>; <span class="name">x</span>: <span class="number">0</span> } <span class="comment">// Make details visible</span>
                  <span class="type"><a href="qml-qtquick-propertychanges.html">PropertyChanges</a></span> { <span class="name">target</span>: <span class="name">recipe</span>; <span class="name">height</span>: <span class="name">listView</span>.<span class="name">height</span> } <span class="comment">// Fill the entire list area with the detailed view</span>

                  <span class="comment">// Move the list so that this item is at the top.</span>
                  <span class="type"><a href="qml-qtquick-propertychanges.html">PropertyChanges</a></span> { <span class="name">target</span>: <span class="name">recipe</span>.<span class="name">ListView</span>.<span class="name">view</span>; <span class="name">explicit</span>: <span class="number">true</span>; <span class="name">contentY</span>: <span class="name">recipe</span>.<span class="name">y</span> }

                  <span class="comment">// Disallow flicking while we're in detailed view</span>
                  <span class="type"><a href="qml-qtquick-propertychanges.html">PropertyChanges</a></span> { <span class="name">target</span>: <span class="name">recipe</span>.<span class="name">ListView</span>.<span class="name">view</span>; <span class="name">interactive</span>: <span class="number">false</span> }
              }

              <span class="name">transitions</span>: <span class="name">Transition</span> {
                  <span class="comment">// Make the state changes smooth</span>
                  <span class="type"><a href="qml-qtquick-parallelanimation.html">ParallelAnimation</a></span> {
                      <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">property</span>: <span class="string">&quot;color&quot;</span>; <span class="name">duration</span>: <span class="number">500</span> }
                      <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">duration</span>: <span class="number">300</span>; <span class="name">属性</span>: <span class="string">&quot;detailsOpacity,x,contentY,height,width&quot;</span> }
                  }
              }
          }
      }

      <span class="comment">// The actual list</span>
      <span class="type"><a href="qml-qtquick-listview.html">ListView</a></span> {
          <span class="name">id</span>: <span class="name">listView</span>
          <span class="name">anchors</span>.fill: <span class="name">parent</span>
          <span class="name">model</span>: <span class="name">RecipesModel</span> {}
          <span class="name">delegate</span>: <span class="name">recipeDelegate</span>
      }
  }

</pre>
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<!-- @@@views/listview/expandingdelegates.qml -->
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